diff --git a/losungepaper.ino b/losungepaper.ino
index 372348d..409ca02 100755
--- a/losungepaper.ino
+++ b/losungepaper.ino
@@ -18,6 +18,9 @@ const String ntpServer = "pool.ntp.org";  // address of ntp server; may also be
 const long  gmtOffset_sec = 3600;  // for localization (gmt = greenwich mean time); in germany: 3600
 const int   daylightOffset_sec = 3600;  // for daylight saving
 
+// onboard LED
+const int LED_ON_WIFI_ERROR = 2;
+
 // style of the frame shown
 sFONT TITLE_FONT = Font20;
 char TITLE_TEXT[] = "Losung heute";
diff --git a/wifi.ino b/wifi.ino
index 96de09c..e250712 100755
--- a/wifi.ino
+++ b/wifi.ino
@@ -1,6 +1,18 @@
 #include <WiFi.h>
 #include "time.h"
 
+void blinkLED(int pin) {
+  pinMode(pin, OUTPUT);
+  delay(500);
+  digitalWrite(pin,HIGH);
+  delay(500);
+  digitalWrite(pin,LOW);
+  delay(500);
+  digitalWrite(pin,HIGH);
+  delay(500);
+  digitalWrite(pin,LOW);
+}
+
 bool connectWiFi() {  // connect to the wifi with the above defined credentials
   if(WiFi.status() == WL_CONNECTED) { return true; }  // return if not connected
   
@@ -11,9 +23,11 @@ bool connectWiFi() {  // connect to the wifi with the above defined credentials
     delay(2000); Serial.printf(".");
     if(WiFi.status() == WL_NO_SSID_AVAIL) {
       Serial.println("\n[WiFi] Failed to connect to WiFi. Reason: WL_NO_SSID_AVAIL");
+      blinkLED(LED_ON_WIFI_ERROR);
       return false;
     } else if(WiFi.status() == WL_CONNECT_FAILED) {
       Serial.println("\n[WiFi] Failed to connect to WiFi. Reason: WL_CONNECT_FAILED");
+      blinkLED(LED_ON_WIFI_ERROR);
       return false;
     }
   }